Parvenir au bout du processus d'installation

Problemes à l'installation de la version 8.x-1.x-dev

In a fresh drupal 8.x-1.x-dev install, with the "tea" package in the profiles directory, the installation process abort with the following message :

Notice: Undefined offset: 1 in template_preprocess_html() (line 1289 of core/includes/theme.inc).

template_preprocess_html(Array, 'html', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 435)
Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 195)
Drupal\Core\Render\Renderer->render(Array, 1) (Line: 139)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 574)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 140)
Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 66)
Drupal\Core\Render\BareHtmlPageRenderer->renderBarePage(Array, 'Choose language', 'install_page', Array) (Line: 76)
Drupal\Core\ProxyClass\Render\BareHtmlPageRenderer->renderBarePage(Array, 'Choose language', 'install_page', Array) (Line: 990)
install_display_output(Array, Array) (Line: 154)
install_drupal(Object) (Line: 39)